<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE>Download</TITLE>
  <style type="text/css">
  .button {
    background-color: #ddcccc;
    border: 1px solid black;
    color: black;
    font-family: Arial;
    font-size: small;
    text-decoration: none;
    padding: 3px;
}
  </style>
  
 </HEAD>

 <BODY>
<span id="countdown"></span>
<a id="download_link" href="download.zip" class="button" style="display:none;">Download</a>
<noscript>JavaScript needs to be enabled in order to be able to download.</noscript>
<script type="application/javascript">
(function(){
   var message = "%d seconds before download link appears";
   // seconds before download link becomes visible
   var count = 10;
   var countdown_element = document.getElementById("countdown");
   var download_link = document.getElementById("download_link");
   var timer = setInterval(function(){
      // if countdown equals 0, the next condition will evaluate to false and the else-construct will be executed
      if (count) {
          // display text
          countdown_element.innerHTML = "You have to wait %d seconds.".replace("%d", count);
          // decrease counter
          count--;
      } else {
          // stop timer
          clearInterval(timer);
          // hide countdown
          countdown_element.style.display = "none";
          // show download link
          download_link.style.display = "";
      }
   }, 1000);
})();
</script>
 </BODY>
</HTML>
